Fixing Member Bonding Layer for Polyimide Delamination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fixing members with a polyimide resin base and silicone rubber elastic layer experience delamination issues, particularly in high-temperature high-humidity environments, due to insufficient bonding caused by the limited number of functional groups on the polyimide resin, leading to low durability of the bond between the base and the elastic layer.
Innovation Solution
Incorporating a bonding layer made from a cured product containing an organic titanate compound, with a component originating from the organic titanate compound ranging from 5% to 95% by mass, which enhances the adhesion between the polyimide resin base and the silicone rubber elastic layer, improving the bond durability in high-temperature high-humidity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bonding layer (cured product of siloxane polymer with SiH group and silane coupling agent) is used between the polyimide resin base and silicone rubber elastic layer, then the manufacturing process is simple, but the bond durability in high-temperature high-humidity environment is low
Solution Approach 1:
The patent changes the chemical composition parameters of the bonding layer by incorporating an organic titanate compound (specifically tetraisopropyl titanate) into the curing system. This chemical parameter change enables the bonding layer to achieve superior adhesion to polyimide resin in high-temperature high-humidity conditions while maintaining a practical manufacturing process.
Solution Approach 2:
The patent creates a composite bonding layer system by combining siloxane polymer, silane coupling agent, and organic titanate compound. This composite material approach leverages the synergistic effects of multiple components to achieve both high bond durability and manageable manufacturing complexity.
2Duration of action of moving object
If repeated fixing operations are performed in a high-temperature high-humidity environment, then the fixing function is maintained, but delamination occurs at the interface between the base and elastic layer
Solution Approach 1:
The patent applies preliminary action by pre-forming a bonding layer with enhanced chemical composition (including organic titanate compound) before assembling the fixing member. This preliminary chemical preparation ensures that the interface between base and elastic layer is pre-conditioned to resist delamination during subsequent repeated fixing operations in harsh environments.
3Strength
If the polyimide resin base with limited functional groups is used, then the base material properties are satisfactory, but the adhesion to elastic layer is insufficient
Solution Approach 1:
The patent introduces an intermediary substance (organic titanate compound) that mediates the adhesion between polyimide resin base and silicone rubber elastic layer. This intermediary forms chemical bonds with both materials, overcoming the limitation of polyimide's limited functional groups and achieving strong adhesion without requiring modification of the base material itself.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of an organic titanate compound-based bonding layer significantly increases the durability of the bond between the base and the elastic layer, as demonstrated by a pressurized hot-water durability test showing the bond remains intact for 12 hours or longer at 150°C and 0.35 MPa pressure.
Implementation Method 1
a bonding layer that is disposed between the base and the elastic layer, is a cured product of a composition containing an organic titanate compound
Data Source
AI summary
A fixing member includes: a base containing a polyimide resin; an elastic layer disposed on the base and containing silicone rubber; and a bonding layer that is disposed between the base and the elastic layer, is a cured product of a composition containing an organic titanate compound, and contains a component originating from the organic titanate compound in an amount of from 5% by mass to 95% by mass inclusive.